After more than six weeks of the de facto closure of the world's most critical energy chokepoint, Iran said the Strait of Hormuz was "completely open" to ship traffic. But as Andrew Chang explains, a few key factors complicate how open the shipping route actually is, and how long the status quo might hold. Intro: 00:00 Where are the mines?: 01:04 A shaky truce: 03:34 The billion-dollar backlog: 06:13 Images provided by The Canadian Press, Reuters and Getty Images »»» Subscribe to CBC News to